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# Read in the data
fish <- read_csv(here("data", "willamette_fish_passage.csv"))

# Wrangle the data
fish_ts <- fish %>% 
  clean_names() %>% 
  mutate(date = lubridate::mdy(date)) %>% # Convert to date 
  select(date, coho, jack_coho, steelhead) %>% # Select only for date and fish of interest
  replace_na(list(coho = 0, jack_coho = 0, steelhead = 0)) %>% # Replace NA values with 0 
  pivot_longer(c(coho:steelhead),
               names_to = "species", 
               values_to = "count") %>% 
  as_tsibble(key = species, index = date) # Convert to tsibble 

Overview

Salmon swim past Oregon Department of Fish and Wildlife’s (ODFW) counting window at the Willamette Falls fishway. Photograph Credit: Eric Ollerenshaw, ODFW

This report details adult fish passage for Coho, Jack Coho, and Steelhead salmon at the Willamette Falls fish ladder on the Willamette River in Oregon from 2001-01-01 to 2010-12-31. Note that the Willamette Falls fish ladder was not operational on the following dates:

• 2005-11-29 to 2005-12-01, 2005-12-06 to 2005-12-08, 2005-12-13 to 2005-12-14
  
• 2008-08-26 to 2008-09-21
  
• 2010-08-23 to 2010-08-27

This report includes is a time series of adult salmon passage, seasonplots of passage, and annual totals of passage for each species.

The data used in this report was accessed from Columbia River DART (Data Access in Real Time). Columbia River DART is a data resource compiling information relating to the Columbia Basin salmon populations and environmental river conditions from federal, state, and tribal databases.

## citing ggmap
#  D. Kahle and H. Wickham. ggmap: Spatial Visualization with ggplot2. The R Journal, 5(1), 144-161. URL
# http://journal.r-project.org/archive/2013-1/kahle-wickham.pdf

library(ggmap)
library(maps)
library(mapdata)
library(ggimage)
library(patchwork)

states <- map_data("state") # map data of states
counties <- map_data("county") # map data of counties

oregon <- states %>% 
  filter(region == "oregon") # filter for oregon

oregon_counties <- counties %>% 
  filter(region == "oregon") %>% # filter for counties in oregon
  mutate( # create new column to map the county fish ladder is located
    clack_or_not = case_when(
      subregion == "clackamas" ~ "clackamas",
      subregion != "clackamas" ~ "other"
    ))
  

oregon_gg <- ggplot(data = oregon, aes(x = long,
                                       y = lat,
                                       group = group)) +
  coord_fixed(1.3) +
  geom_polygon(color = "black") +
  ggmap::theme_nothing() +
  geom_polygon(data = oregon_counties, aes(fill = clack_or_not), color = "white") +
  scale_fill_manual(values = c("turquoise3", "forestgreen")) +
  geom_polygon(color = "black", fill = NA) 
  

location_ladder <- data.frame(long = -122.6197271, # obtained from google maps
                              lat = 45.3511544,
                              image = here("images", "coho.png"))  
  
clackamas <- counties %>% 
  filter(subregion == "clackamas") # extract county fish ladder is in

clack_gg <- ggplot(data = clackamas, aes(x = long, 
                                       y = lat)) +
  coord_fixed(1.3) +
  geom_polygon(color = "black", fill = "turquoise3") +
  ggmap::theme_nothing() +
  geom_polygon(color = "black", fill = NA) +
  geom_image(data = location_ladder, aes(x = long,
                                         y = lat,
                                         image = image),
             size = 0.1) 


clack_gg / (plot_spacer() + oregon_gg ) +
  plot_annotation(title = "Map of Oregon State and Clackamas County",
                  subtitle = "Willamette Fish Ladder is represented by the fish") +
  plot_layout(heights = c(1.5,1))

Original time series

fish_labels <- c("Coho", "Jack Coho", "Steelhead")
names(fish_labels) <- c("coho", "jack_coho", "steelhead")

ggplot(data = fish_ts, 
       aes(x = date, 
           y = count)) +
  geom_line(aes(color = species)) +
  facet_grid(species~., 
             scales = "free",
             labeller = labeller(species = fish_labels)) +
  scale_color_manual(values=c("cadetblue4", "mediumvioletred", "orange")) +
  labs(x = "\nYear",
       y = "Adult Salmon Count",
       title = "Salmon Adult Passage at Willamette Falls, OR\n") +
  theme_minimal() +
  theme(legend.position = "none",
       axis.title = element_text(face = "bold", size = 12),
      plot.title = element_text(face = "bold", size = 12))

Figure 1. Time series of adult passage for Coho (teal), Jack Coho (magenta), and Steelhead (orange) salmon at Willamette Falls fish ladder on the Willamette River, Oregon between 2001-2010. Data: Columbia River DART. 2021.

• Coho salmon passage fluctuated between lower and higher counts every couple years before greatly increasing in 2009-2010, doubling in counts from 2008.
• Jack coho salmon passage was the lowest out of the three species, with very low counts in 2007 before reaching a peak at the end of 2008. They also fluctuated between lower and higher counts every few years.
• Steelhead salmon passage remained relatively stable between 2001-2010.

Seasonplots

fish_month <- fish_ts %>%
  group_by_key() %>% #key = species
  index_by(yr_mo = ~yearmonth(.)) %>% # group by time index year month
  summarise(monthly_mean_count = mean(count, na.rm = TRUE)) %>% # mean count for each month 
  mutate(species = recode(species,
                          coho = "Coho",
                          jack_coho = "Jack Coho",
                          steelhead = "Steelhead"))



fish_month %>% 
  gg_season(y = monthly_mean_count, 
            pal = (brewer.pal(10, "Paired" ))) +
  labs(x = "Month",
       y = "Mean monthly count", 
       title = "Average monthly count of adult fish passage for Willamette fish ladder",
       color = "Year") +
  theme_minimal() +  
  theme(axis.title = element_text(face = "bold", size = 12),
        plot.title = element_text(face = "bold", size = 12),
        strip.text = element_text( size = 12))

Figure 2. Mean count of adult Coho, Jack Coho, and Steelhead passage at the Willamette fish ladder between 2001-2010. Data: Columbia River DART. 2021.

• Steelhead passage at the Willamette fish ladder begins in December, and peaks in late spring/early summer with May and June being the months with the highest mean count. In July, the number of Steelhead counted decreases and remains low through the end of fall.
• Coho and Jack Coho passage occurs during the fall months of September and October, with the highest mean counts occurring in September. Little to no Coho or Jack Coho are counted after November.

Summary statistics and analysis

fish_annual <- fish_ts %>% 
  group_by_key() %>% 
  index_by(yr = ~year(.)) %>% # index by year
  summarise(annual_total = sum(count)) %>%  # get annual totals
  mutate(year = factor(yr)) # convert year to a factor

ggplot(data = fish_annual, 
       aes(x = year, 
           y = annual_total)) +
  geom_col(aes(fill = annual_total)) + # 
  scale_fill_viridis_c(option = "viridis") +
  facet_grid(species~., 
             scales = "free",
             labeller = labeller(species = fish_labels)) +
  labs(title = "Yearly Totals of Different Salmon Species at the Willamette Falls",
       x = "Year",
       y = "Annual totals",
       fill = "Annual totals") +
  theme_minimal() +
  theme(axis.title = element_text(face = "bold", size = 12),
        strip.text.y = element_text(face = "bold", size = 12),
        axis.text.y = element_text(face = "bold", size = 10),
        axis.text.x = element_text(face = "bold", size = 11),
        panel.grid.major.x = element_blank(),
        panel.grid.minor.y = element_blank(),
        legend.text = element_text(face = "bold", size = 10),
        legend.title = element_text(face = "bold", size = 10.5),
        plot.title = element_text(face = "bold", size = 13)
        )

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Figure 3. Annual totals of adult passage for Coho, Jack Coho, and Steelhead salmon at Willamette Falls fish ladder on the Willamette River, Oregon between 2001-2010. Data: Columbia River DART. 2021.

• Except for the years 2009 and 2010, the annual counts for Coho salmon stayed relatively stable at counts below 10,000 per year.
• Steelhead salmon had the highest annual counts every year, except for 2009, meanwhile Jack Coho salmon had the lowest annual counts every year except for 2002.
• Overall 2010 was an above average year for yearly adult passage at the Willamette Falls fish ladder for all three species, meanwhile 2005 and 2007 was a below average year.